Asphalt plant

In asphalt mixing plants and asphalt mixing plants asphalt mix is by a thermal mixing process of mineral rocks, Filler ( rock flour ), binders (usually bitumen ) and possibly manufactured additives. The mixing process is usually optimal when the mineral is mixed homogeneously and is completely wetted by the binder. The complex procedure of the entire asphalt mixing plant is usually possible via a central control. The average investment performance of an asphalt mixing plant is generally 80-320 tons of asphalt mix per hour. The necessary security requirements for asphalt mixing plants are treated in the standard DIN EN 536. The requirements on the asphaltic are defined in the standard DIN EN 13108.

Production

There are basically two production processes:

In the continuous production of the mixing process in the ( non-stop ) Continuous operation is performed. The individual components are continuously added to the mixing process. This method is particularly suitable for large building lots with a uniform mix.

In the batchwise production are in operation for a recipe that previously weighed components of the asphalt mixture in batches in a blender asphalt. This method is more flexible, because it allows the changes in the batch mixing recipe. Also, can achieve a higher mixing quality by adding more precise quantities and custom mixing times and mixing cycles here generally.

In Europe, the discontinuous production is used for asphalt production mainly.

Types of asphalt mixing plants

There are three different types of plant in asphalt mixing plants:

• Stationary plant types are usually placed conveniently to cover from there as large a delivery area to keep (such as highway exits or industrial areas of big cities ) and to the delivery traffic to the site shortly. Partial standing of the asphalt mixing plants in regional mineral deposits such as quarries, to keep the mineral delivery cost. This type of system requires a concrete foundation.
• Easily removable plant types suitable for construction sites with a limited time frame, which can then move with a construction phase (for example, highway construction ). This type of system usually has its own steel foundation.
• Wheeled mobile plant types are usually used when only smaller batch sizes are needed in remote rural areas ( for example, road construction in Siberia). This type of system requires at the site only a passable by truck space than foundation.

Plant groups

The asphalt mixing systems are usually modular, with different modules elementary functions:

• Dosers for mineral materials ( pre-dosing )
• Drying of minerals (dry drum with burner )
• Filterentstaubung for the recovery of costs incurred in the process of dust ( dust )
• Heißabsiebeeinheit ( screening module )
• Silo for the storage of hot aggregates ( Heißmineralsilo )
• Module with scales for weighing the various components (weighing module )
• Module with a mixer for mixing the necessary components ( mixer module )
• Reservoir for the storage of the finished material to be mixed ( Mischgutsilo ). This module is located under the mixer module, as well as arrange beside. From here, the asphalt mix is (usually) loaded on truck for immediate transport to the construction site.
• Storage containers for filler (filler silos)
• Storage containers for binder (bitumen tank system )

The most common modules for additional functionality include:

• Addition unit for asphalt granulate ( Reclaimed Asphalt ) directly into the mixer
• Addition unit for asphalt granulate ( Reclaimed Asphalt ) via a parallel drum
• Color additions for colored asphalt mix
• Addition of foamed bitumen for the production of foamed asphalt (low temperature asphalt)
• Addition unit for fibrous materials
• Burner with fuel storage eg brown coal dust as a cheap source of energy

Manufacturer (selection)

• Ammann
• Amomatic
• Astec
• Benninghoven
• Comaco ( Gibat - Ohl has taken over )
• Cesan
• Ekip Asphalt Plants
• E -MAK
• Fayat (includes: Marini, Ermont )
• Intrame
• Lintec
• Teltomat
• Wasmus